Facile route to achieve MoSe2-Ni3Se2 on nickel foam as efficient dual functional electrocatalysts for overall water splitting

Since the catalytic activity of present nickel-based synthetic selenide is still to be improved, MoSe 2 -Ni 3 Se 2 was synthesized on nickel foam (NF) (MoSe 2 -Ni 3 Se 2 /NF) by introducing a molybdenum source. After the molybdenum source was introduced, the surface of the catalyst changed from a single-phase structure to a multiphase structure. The catalyst surface with enriched active sites and the synergistic effect of MoSe 2 and Ni 3 Se 2 together enhance the hydrogen evolution reactions (HER), the oxygen evolution reactions (OER), and electrocatalytic total water splitting activity of the catalyst. The overpotential of the MoSe 2 -Ni 3 Se 2 /NF electrocatalyst is only 259 mV and 395 mV at a current density of 100 mA/cm 2 for HER and OER, respectively. MoSe 2 -Ni 3 Se 2 /NF with a two-electrode system attains a current density of 10 mA/cm 2 at 1.60 V. In addition, the overpotential of HER and OER of MoSe 2 -Ni 3 Se 2 /NF within 80000 s and the decomposition voltage of electrocatalytic total water decomposition hardly changed, showing an extremely strong stability. The improvement of MoSe 2 -Ni 3 Se 2 /NF catalytic activity is attributed to the establishment of the multi-phase structure and the optimized inoculation of the multi-component and multi-interface.